Mercedes W221 Panoramic Sunroof Sliding Roof Centre Window Glass Panel AS3

Mercedes W221 Panoramic Sunroof Sliding Roof Centre Window Glass Panel AS3 is an original part from the Car windows category, designed for the factory sunroof in W221 S-Class models. The AS3 standard tinted glass provides increased thermal comfort and reduces interior heating, while maintaining high transparency and an aesthetic roof appearance.

Specifications and technical data

• SKU: A2217800421
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2217800421
• Substitutable numbers: A2217800421, A 221 780 04 21
• Category: Car Glass

Technical characteristics of the roof glass

The AS3 standard tinted sunroof glass has been designed to effectively reduce solar radiation and improve driving comfort in sunny conditions. The laminated glass used, with carefully selected light transmittance, reduces glare while allowing natural illumination of the cabin. The construction is matched to the factory sunroof mechanism in the Mercedes S-Class W221, which enables proper operation with the guides, seals, and water drainage system.

Purpose and fitment for the Mercedes W221

The offered roof glass is a component dedicated to the factory sunroof in the W221 generation Mercedes S-Class. By maintaining the original geometry and glass thickness, it ensures proper fitment with the roof frame and compatibility with factory mounting elements. Such a fit minimizes the risk of leaks, wind noise, and issues with the sliding/tilting mechanism operation.

Benefits of using AS3 tinted glass

The use of AS3 standard tinted roof glass in the Mercedes W221 translates into a number of practical benefits:

• reduction of vehicle interior heating while parked and driving in full sun,
• increased passenger comfort due to the reduction of light intensity entering through the roof,
• improved protection of interior elements against fading caused by solar radiation,
• preservation of the consistent, elegant body line characteristic of the S-Class.

For users who value comfort and functionality, the tinted construction offers a clear advantage over standard, lighter roof glazing.

Condition of the item and service application

The sunroof glass is a secondary market component, which allows for an economical repair of the roof system while maintaining the manufacturer's original specifications. This type of component is particularly useful in cases of mechanical glass damage, cracks, or problems resulting from previous non-factory modifications. Replacing it with an original glass with the correct profile and tint facilitates the restoration of proper sunroof operation and the vehicle's factory appearance.

Support with selection and additional information

If you are planning a comprehensive repair or upgrade of the roof area in your Mercedes and need other elements from the same group, such as other windows, seals, or additional glass panels, check the available parts in the Mercedes car windows category.

When choosing used glass elements for the roof, it is worth paying attention to the installation method, compatibility with the factory mechanism, and the cost-effectiveness of the repair compared to purchasing a new component. To better plan your service and optimize costs, check out the guide Rising repair costs and the boom in used parts – how to save on car service?, where you will find practical tips on the safe use of OEM used parts.